💡 Computer Science English – Learn Key Technical Terms

📘 Introduction

Whether you’re a developer, system administrator, student, or IT enthusiast, understanding technical English is essential in the world of computer science. This guide presents key vocabulary and common expressions used in IT, programming, networks, cybersecurity, and more — all translated and explained clearly.

By mastering this terminology, you’ll improve your ability to read documentation, follow courses, pass technical interviews, and collaborate with international teams.

🖥️ Computer Vocabulary

Here are the basic terms that every user or digital professional should know in English. They cover main components, media, and essential functions related to general computing.

• computer – an electronic device that processes data
• hardware – the physical parts of a computer
• software – programs and applications used by a computer
• operating system (OS) – software that manages computer hardware and software
• application – a program designed for a specific task
• user interface (UI) – how users interact with a device or program
• update – a new version or fix for software
• bug – an error or problem in software
• backup – a copy of data for recovery
• file – a collection of data stored digitally
• folder – a container used to organize files
• drag and drop – to move items using a mouse
• install – to set up software on a computer
• uninstall – to remove software from a computer
• reboot / restart – to turn the computer off and on again
• crash – when a program or system stops working suddenly
• memory (RAM) – temporary storage used by running programs
• storage / hard drive – where data is saved permanently
• CPU (central processing unit) – the brain of the computer
• display / screen – the visual output device
• mouse – a pointing device to interact with the computer
• keyboard – a device used to input text
• printer – a machine that makes paper copies
• USB stick / flash drive – a small device for portable storage
• desktop – the main screen or workspace on a computer
• laptop – a portable computer
• login / log in – to enter your account on a device or site
• logout / log out – to exit your account
• settings – options to configure how something works
• notification – an alert or message from a program
• access – the ability to use or enter something

🌐 Networks & Internet

In today’s digital world, understanding network and Internet terms is essential. These words are widely used in web jobs, technical support, and network administration.

• network – a group of connected devices
• Wi-Fi / wireless – a way to connect without cables
• LAN (Local Area Network) – a network in a small area like a home or office
• WAN (Wide Area Network) – a network over a large area, like the Internet
• IP address – a unique number for each device on a network
• DNS (Domain Name System) – turns website names into IP addresses
• router – a device that directs Internet traffic
• modem – a device that connects you to the Internet
• bandwidth – the amount of data that can move in a network
• ping – a test to check network speed or response
• latency – the delay before data moves
• firewall – a tool that blocks unsafe data
• proxy – a server that acts between you and the Internet
• VPN (Virtual Private Network) – a secure way to connect to the Internet
• ISP (Internet Service Provider) – a company that gives Internet access
• upload / download – to send or get data online
• streaming – playing video or audio over the Internet
• server – a computer that provides data to others
• client – a computer that receives data from a server
• domain name – the name of a website
• web hosting – service that stores websites online
• HTTP / HTTPS – rules for web data (HTTPS is secure)
• URL (Uniform Resource Locator) – a web address
• browser – a program to view websites
• cookie – data saved by websites in your browser
• cache – stored data to speed up browsing
• cloud computing – using the Internet to store and access data
• data center – a place with many servers for storing data
• IoT (Internet of Things) – smart devices connected to the Internet

👨‍💻 Programming & Development

This section lists essential English terms used in software development, coding, and computer programming, regardless of the language (Python, JavaScript, Java, etc.).

• code – written instructions for a computer
• source code – the original code written by a programmer
• program – a set of instructions a computer follows
• script – a small program that automates tasks
• function / method – a reusable block of code that does something
• variable – a named value that can change
• parameter / argument – input values for functions
• loop – code that repeats actions
• conditional statement – code that makes decisions
• if / else – logic to choose between options
• array / list – a collection of items in a set order
• object – a structure that contains data and functions
• class – a template for creating objects
• inheritance – sharing code from one class to another
• debug / debugging – finding and fixing code problems
• compile – turning code into a program
• execute / run – to start a program
• syntax error – a mistake in how code is written
• logic error – a mistake in what code does
• IDE (Integrated Development Environment) – software used for coding
• text editor – a basic tool for writing code
• framework – tools and rules to build programs faster
• library – pre-written code to reuse
• API (Application Programming Interface) – a way for programs to talk to each other
• version control – tracking and managing code changes
• repository – a storage place for code
• commit – saving code changes
• pull / push – get or send code to a shared place
• merge – combine different versions of code
• open source – code that is free to use and change

🛠️ Systems & Administration

This section covers essential vocabulary to understand system administration, server management, and the roles of network or system administrators.

• system administrator – a person who manages and maintains computer systems
• IT support – help provided for technical computer issues
• server – a computer that provides services to other computers
• client-server architecture – a model where servers provide resources to clients
• uptime – the time a system is working without interruption
• downtime – the period when a system is not available
• scheduled maintenance – planned work to update or fix a system
• command line – a text interface to control a computer
• shell – a program that interprets commands
• task manager – a tool to view and manage running programs
• process – a running program on a computer
• service – a background task on a system
• system logs – records of system events and actions
• boot process – the steps a computer takes to start
• permissions / access rights – rules about who can do what on a system
• administrator / root – the user with full control of the system
• virtual machine (VM) – software that runs a separate operating system
• container – a lightweight, isolated environment for running software
• automation script – code that performs tasks automatically
• monitoring tool – software to watch system performance
• patch – a fix for software bugs or security issues
• deployment – the process of making software ready to use
• configuration – the setup or settings of a system
• backup & recovery – saving data and restoring it when needed
• cloud infrastructure – servers and services available over the Internet
• DevOps – a method combining development and operations
• high availability – system design to avoid downtime
• load balancing – distributing work across multiple systems

🔐 Cybersecurity

Cybersecurity is a critical field for any organization. Here are essential English terms used in information security, data protection, and cyberattack prevention.

• cybersecurity – protecting systems and data from digital threats
• cyberattack – a malicious action against a computer system
• data breach – when sensitive information is exposed or stolen
• phishing – tricking people into giving personal data
• malware – software designed to harm a computer
• spyware – software that secretly collects information
• ransomware – malware that locks files until payment is made
• virus – a program that spreads and causes damage
• worm – a program that replicates itself across systems
• trojan horse – malware that hides inside normal software
• antivirus software – software that detects and removes viruses
• firewall – a tool that blocks unauthorized access
• encryption – turning data into a secret code
• decryption – turning coded data back into readable form
• two-factor authentication (2FA) – extra security using two methods to log in
• password manager – a tool to store and manage passwords
• identity theft – using someone else’s personal data illegally
• zero-day attack – a surprise attack using an unknown flaw
• penetration testing – testing a system’s security by simulating attacks
• security breach – a break in the system’s protection
• access control – rules for who can access what
• network security – protecting a computer network
• endpoint security – protecting devices like computers and phones
• data protection – keeping data safe from loss or theft
• GDPR (General Data Protection Regulation) – European rules for data privacy
• SIEM (Security Information and Event Management) – software that collects and analyzes security data
• incident response – reacting to and managing security problems
• vulnerability – a weakness in a system
• threat – something that could cause harm to a system
• patch management – updating software to fix problems

👥 IT Jobs & Roles

The IT field offers a wide range of careers, each with specific responsibilities. Here is common vocabulary to describe professional roles in the IT sector.

• software developer – someone who creates software programs
• web developer – someone who builds websites
• frontend developer – someone who designs what users see
• backend developer – someone who works on server-side systems
• full-stack developer – someone who does both frontend and backend
• mobile developer – someone who builds apps for phones or tablets
• DevOps engineer – someone who connects development and operations
• systems administrator – someone who manages computer systems
• network administrator – someone who manages computer networks
• IT technician – someone who fixes hardware and software issues
• IT support specialist – someone who helps users with technical problems
• security analyst – someone who monitors and protects systems
• penetration tester – someone who tests system security by simulating attacks
• cloud engineer – someone who builds and manages cloud systems
• database administrator (DBA) – someone who manages databases
• data analyst – someone who interprets data to help decision-making
• data scientist – someone who uses data to build models and predictions
• AI engineer – someone who develops artificial intelligence systems
• machine learning engineer – someone who builds systems that learn from data
• IT project manager – someone who leads tech projects
• business analyst – someone who finds solutions to business problems using data
• scrum master – someone who helps teams follow agile methods
• UX designer – someone who improves the user experience
• UI designer – someone who designs user interfaces
• QA tester – someone who checks software for problems

💬 Useful Expressions and Commands

Here are common expressions, phrases, and commands used in computing contexts in English. They are useful for reading documentation, working with technical teams, or using a terminal.

📘 Common Technical Expressions

• push to repo – send code to a code repository
• merge a branch – combine one branch of code with another
• commit changes – save your code edits to the project history
• raise a ticket – create a support or issue request
• code review – check code written by someone else
• deployment pipeline – steps to automatically test and release code
• hotfix – a quick fix for an urgent issue
• refactor the code – improve code structure without changing what it does
• deprecated function – a function that should no longer be used

🧑‍💻 Common Unix / Linux Commands

• ls – list the files in a directory
• cd – change to another directory
• pwd – show the current directory path
• mkdir – create a new directory
• rm -rf – delete a folder and its contents permanently
• cp – copy a file or folder
• mv – move or rename a file
• touch – create an empty file
• grep – search for text in a file
• chmod – change file permissions
• chown – change the owner of a file

🔎 Other Useful Expressions

• bug tracking – keeping track of errors and issues in software
• feature request – asking for a new function to be added
• rollback – return to an earlier version of a system
• continuous integration – automatically testing and combining code changes
• release notes – a summary of new features and fixes in an update
• versioning system – tool to manage changes in code over time
• runtime error – an error that happens while a program is running

📝 Conclusion

This guide helped you explore key vocabulary related to computing and information technology in English. Mastering these terms is essential for working in an international environment, taking technical courses, reading documentation, or collaborating with global teams.

💡 Remember: English is the language of computing. The more you use it in your learning, the faster you'll improve.